7
1.3 System sizing
To ensure the correct function of the system, it is
important that the pump is of the right type.
During operation, the CU 301 controls the pump
speed within the range from 3,000 rpm to 10,700
rpm, see fig. 6.
It is recommended to follow the guidelines below.
Fig. 6 Pump curves at 3,000 rpm and
10,700 rpm
A: Minimum head at no flow.
B: Maximum head at rated flow.
The following must be fulfilled:
• Minimum head at no flow < static head + system
pressure.
Comment: If this is not fulfilled, the pressure may
exceed the pressure set on the CU 301.
• Maximum head at rated flow > dynamic head +
system pressure.
Comment: If this is not fulfilled, the pressure may
fall below the pressure set on the CU 301.
Maximum head at rated flow and minimum head at
no flow can be found in the following sections.
1.4 SQE and SQE-NE
TM01 8547 0400
H [ft]
Q [gpm]
B
A
Pump curve
at 10,700 rpm
Pump curve
at 3,000 rpm
Q
rated flow
Pump type
Min. head
at 0 gpm,
3,000 rpm
Max. head
at rated flow,
10,700 rpm
[feet] [feet]
5 SQE-90 12 104
5 SQE-140 18 161
5 SQE-180 24 218
5 SQE-230 31 275
5 SQE-270 37 332
5 SQE-320 43 389
5 SQE-360 49 446
5 SQE-410 55 503
5 SQE-450 61 560
10 SQE-110 12 102
10 SQE-160 17 158
10 SQE-200 23 214
10 SQE-240 29 270
10 SQE-290 34 326
10 SQE-330 40 382
15 SQE-70 10 80
15 SQE-110 4 121
15 SQE-150 19 161
15 SQE-180 24 202
15 SQE-220 29 242
15 SQE-250 33 283
15 SQE-290 38 323
22 SQE-40 5 35
22 SQE-80 9 75
22 SQE-120 14 115
22 SQE-160 18 155
22 SQE-190 23 195
22 SQE-220 27 235
30 SQE-40 5 31
30 SQE-90 11 78
30 SQE-130 16 125
10 SQE-100 NE 10 96
10 SQE-140 NE 15 134
10 SQE-180 NE 20 173
10 SQE-220 NE 25 212
10 SQE-260 NE 30 251
10 SQE-300 NE 34 290
10 SQE-340 NE 39 329
22 SQE-40 NE 35 290
22 SQE-80 NE 39 322
22 SQE-110 NE 42 353
22 SQE-140 NE 46 385
22 SQE-180 NE 50 417
22 SQE-210 NE 54 448
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